backing to 5.2.1, problem with threading and "cxa_atexit"

Hi,

I though I would back my system to RELENG_5.2, as I more or less 
acidentally installed a current :-)=  (Clever, he? :^)

So, now many apps fail since the symbol "__cxa_atexit" cannot be found. I 
recon it is in libpthread in current, but wasn't there at 5.2.1, right?

Question is, do I have to rebuild all apps (or go back to current), or can 
I do some libmap.conf magic? Just checking with nm -D in /usr/lib, I cannot 
find the symbol defined anywhere for 5.2.1?

Thanks,
Palle